kernel: memory: Add PageLinkedList class, to manage a list of pages.
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@ -158,6 +158,7 @@ add_library(core STATIC
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hle/kernel/memory/address_space_info.h
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hle/kernel/memory/memory_block.h
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hle/kernel/memory/memory_types.h
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hle/kernel/memory/page_linked_list.h
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hle/kernel/memory/slab_heap.h
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hle/kernel/memory/system_control.cpp
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hle/kernel/memory/system_control.h
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@ -0,0 +1,93 @@
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <list>
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#include "common/assert.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "core/hle/kernel/memory/memory_types.h"
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#include "core/hle/result.h"
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namespace Kernel::Memory {
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class PageLinkedList final {
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public:
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class Node final {
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public:
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constexpr Node(u64 addr, std::size_t num_pages) : addr{addr}, num_pages{num_pages} {}
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constexpr u64 GetAddress() const {
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return addr;
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}
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constexpr std::size_t GetNumPages() const {
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return num_pages;
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}
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private:
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u64 addr{};
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std::size_t num_pages{};
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};
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public:
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PageLinkedList() = default;
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PageLinkedList(u64 address, u64 num_pages) {
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ASSERT(AddBlock(address, num_pages).IsSuccess());
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}
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constexpr std::list<Node>& Nodes() {
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return nodes;
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}
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constexpr const std::list<Node>& Nodes() const {
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return nodes;
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}
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std::size_t GetNumPages() const {
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std::size_t num_pages = 0;
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for (const Node& node : nodes) {
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num_pages += node.GetNumPages();
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}
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return num_pages;
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}
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bool IsEqual(PageLinkedList& other) const {
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auto this_node = nodes.begin();
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auto other_node = other.nodes.begin();
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while (this_node != nodes.end() && other_node != other.nodes.end()) {
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if (this_node->GetAddress() != other_node->GetAddress() ||
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this_node->GetNumPages() != other_node->GetNumPages()) {
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return false;
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}
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this_node = std::next(this_node);
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other_node = std::next(other_node);
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}
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return this_node == nodes.end() && other_node == other.nodes.end();
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}
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ResultCode AddBlock(u64 address, u64 num_pages) {
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if (!num_pages) {
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return RESULT_SUCCESS;
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}
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if (!nodes.empty()) {
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const auto node = nodes.back();
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if (node.GetAddress() + node.GetNumPages() * PageSize == address) {
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address = node.GetAddress();
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num_pages += node.GetNumPages();
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nodes.pop_back();
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}
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}
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nodes.push_back({address, num_pages});
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return RESULT_SUCCESS;
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}
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private:
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std::list<Node> nodes;
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};
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} // namespace Kernel::Memory
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